I have recently filed Form I-140 in
the category of extraordinary ability. Currently I am on J1 and waiting for H1B
approval from USCIS. I would like to
concurrently file I-485 also. If I file I-485 now, may I change my current job
after 180 days? Thank you for your time and
advice.

Answer:

Under AC21, you
can change job after 180 days of filing I-485. But
the new employment position should be similar or same as the job
classification in the I-140, and the
I-140 petition should be approved already.

If
your I-140 petition is still pending, you can not change employer, even the
I-485
application has passed 180 days. Here, only the APPROVED
I-140 is portable to a new employer, after passage of 180 days of I-485
filing.